> > Interesting information! So, how come we model car racers see
> > longer run-times with 3000s (as well as, allegedly, more punch...)?
> cognitive dissonance.
> Have you seen "more punch"? vs. a Sanyo RC 2400 NiCad?
I haven't run either, but I've heard that Sanyo 3ks are better than
*most* 2-4s - there are supposed to be a couple of "good batches"
of 2-4s but the rest are less impressive.
> the batteries have a higher internal resistance, and the voltage will be
> at a given current, hence less power. One can compensate by gearing for
Do you have a source on IR figures for both? I'd be interested...
> Most car motors die (slow death) at 35A (actually, the armatures
> magnets backwards, killing them)
> i.e.., you don't run high currents
<shrug> That depends entirely on your definition of "high current". My
physics teacher used to reckon an amp was large; the electric shunting
truck I worked on a couple of years ago maxed out around 600A.
We dump 2ks in five minutes, which is in excess of a 20A average,
and since we're off the power for significant parts of a lap I'd imagine
that peaks are rather higher. Assuming my speedo's calibrated okay,
I used to find that setting the current limit below 40A gave a large
drop in torque out of corners.
> Steve Neu did a careful analysis with constant load lab equipment, and lab
> acquiring equipment. You can read about it in Sailplane and Electric
From the spelling, I take it that's an American magazine...
> btw, the Sanyos are significantly better than Panasonics.
What about the Powers cells?